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Texas Instruments LM3204TLX/NOPB
- Part No.:
- LM3204TLX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFBGA
- Datasheet:
-
LM3204TLX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 10DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,863
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Product details
Overview
LM3204TLX/NOPB from Texas Instruments is a step-down DC-DC converter optimized for powering RF power amplifiers (PAs) in mobile phones and portable RF devices. It delivers adjustable output voltage from 0.6 V to 3.6 V, supports up to 1.5 A load current in PWM mode and 1.2 A in bypass mode, operates from a single Li-ion cell (2.7 V–5.5 V input), and integrates synchronous rectification with internal 120 mΩ/90 mΩ MOSFETs.
For engineers reviewing the LM3204TLX/NOPB datasheet, LM3204TLX/NOPB pinout, LM3204TLX/NOPB application, or LM3204TLX/NOPB equivalent, this device is selected for battery-powered RF PA biasing where dynamic output voltage control, high efficiency at light-to-heavy loads, low quiescent current in shutdown, and minimal external component count are critical design requirements.
Technical Context
The LM3204TLX/NOPB implements a current-mode synchronous buck converter with integrated high-side and low-side N-channel MOSFETs. Its control loop uses an error amplifier and PWM comparator to regulate output voltage via duty-cycle modulation of the 1.5 MHz fixed-frequency switching node.
It supports three operating modes: PWM mode for regulated high-efficiency operation, forced bypass mode for direct battery-to-PA connection with minimal dropout, and automatic bypass mode that transitions between PWM and bypass based on input-output voltage differential and load conditions - enabling optimal efficiency across varying RF PA power levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion battery operation including full discharge curve down to 2.7 V. |
| Output Voltage Range | 0.6 V to 3.6 V - digitally programmable via analog control pin (VCTRL), eliminating need for external feedback resistors. |
| Max Output Current | 1.5 A in PWM mode - sufficient for mid-to-high-power LTE/WCDMA RF PAs without thermal derating in micro-SMD package. |
| Switching Frequency | 1.5 MHz typical - enables use of tiny 1.0 µH inductor and two 10 µF ceramic capacitors, minimizing PCB area. |
| Shutdown Quiescent Current | 0.1 µA typical - extends battery life during phone standby or RF PA idle periods. |
| Bypass Mode Dropout | 120 mV at 1.2 A - ensures minimal voltage loss when directly connecting battery to PA under high-power transmit bursts. |
| Thermal Shutdown Threshold | 150 °C junction temperature - protects device during sustained high-current operation in compact handset layouts. |
Pinout & Package
LM3204TLX/NOPB is housed in a 12-pin, 1.6 mm × 1.6 mm × 0.55 mm micro-SMD (TL) package with bottom-side thermal pad for enhanced heat dissipation in space-constrained mobile designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Connects to Li-ion battery or system rail; requires local 10 µF ceramic decoupling capacitor. |
| 2 (GND) | Power Ground | Common return path for input, output, and internal circuitry; must be tied to thermal pad. |
| 3 (SW) | Switch Node | Drives external 1.0 µH inductor; high dv/dt node requiring tight layout and guard ring. |
| 4 (VOUT) | Regulated Output | Delivers controlled voltage to RF PA collector/drain; connects to 10 µF output capacitor. |
| 5 (EN) | Enable Control | Active-high logic input; pulls low to enter 0.1 µA shutdown mode. |
| 6 (VCTRL) | Analog Voltage Control | 0.6 V–1.8 V input sets output voltage linearly (VOUT = 0.6 V + VCTRL); no external resistor divider needed. |
| 7 (FBYP) | Bypass Mode Select | High = forced bypass; floating/low = automatic or PWM mode; controls internal MOSFET conduction path. |
| 8 (PGND) | Power Ground (Separate) | Dedicated ground for high-current switch paths; must connect to main GND plane under thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Synchronous FETs | 120 mΩ high-side + 90 mΩ low-side MOSFETs eliminate external power switches and reduce BOM count by 4 components. |
| Dynamic Output Voltage Control | VCTRL pin enables real-time PA bias adjustment from baseband processor - optimizing linearity and efficiency per transmission mode. |
| Automatic Bypass Transition | Seamlessly switches between PWM and bypass modes when VIN − VOUT < 150 mV, maintaining regulation while minimizing conduction loss. |
| Overcurrent & Thermal Protection | Internal cycle-by-cycle current limit and thermal shutdown prevent damage during short-circuit or board-level overheating events. |
| Micro-SMD Package | 1.6 mm × 1.6 mm footprint with 0.4 mm pitch saves >60% board area vs. comparable QFN solutions - critical for antenna-proximate RF sections. |
Applications
| Cellular Handsets | Portable Radios |
|---|---|
|
Use Scenario: LTE/WCDMA smartphone transmitting at maximum power class (e.g., 27 dBm). IC Role / Device Role / Timing Role: Dynamic PA bias controller regulating collector supply voltage in real time based on modulation envelope. Use Value: Enables 20% higher average PA efficiency across modulation bandwidth by tracking instantaneous power demand - extending talk time. |
Use Scenario: Battery-powered handheld two-way radio operating in TDMA burst mode. IC Role / Device Role / Timing Role: Fast-transient PA supply delivering stable 2.8 V during 500 µs transmit bursts with <10 µs response time. Use Value: Eliminates output voltage droop during RF burst edges, preserving adjacent channel leakage ratio (ACLR) performance. |
| RF PC Cards | Wearable Transceivers |
|
Use Scenario: Mini-PCIe LTE module in ultrabook with strict thermal envelope. IC Role / Device Role / Timing Role: Compact, thermally efficient PA supply replacing discrete buck + LDO solution. Use Value: Reduces solution height to 0.55 mm and peak junction temperature by 25 °C vs. QFN alternative - enabling fanless design. |
Use Scenario: Bluetooth LE audio transmitter in earbud with 120 mAh battery. IC Role / Device Role / Timing Role: Ultra-low-IQ PA supply enabling 300-hour standby with periodic BLE advertising. Use Value: Cuts quiescent current to 0.1 µA in shutdown - contributing <1.2% to total system standby drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF PA power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62260DRVR | Fixed 1.8 V/2.5 V/3.3 V outputs; no analog VCTRL pin; 2.05 MHz switching frequency. | Lacks dynamic PA bias control - suitable only for static-voltage RF front-end ICs, not envelope-tracking PAs. | Select when output voltage is invariant and board space allows larger 2.0 mm × 2.0 mm WSON package. |
| MAX17222ELT+T | 0.5 V–3.3 V adjustable output via resistor divider; 1.6 MHz switching; 1.2 A max output. | Requires external feedback network and lacks bypass mode - less efficient under high-VIN/VOUT-differential conditions. | Choose if analog control interface is unnecessary and thermal pad soldering capability is limited. |
Compared with TPS62260DRVR and MAX17222ELT+T, the LM3204TLX/NOPB uniquely combines analog voltage control, automatic bypass transition, and micro-SMD packaging - making it the only option capable of meeting dynamic PA biasing, size, and efficiency requirements simultaneously in modern cellular handsets.
Availability
LM3204TLX/NOPB is available at Aetrix Electronics and suitable for cellular handsets, portable radios, and RF PC cards requiring stable component supply, long-term lifecycle support, and RoHS-compliant micro-SMD packaging.
Supply support for LM3204TLX/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 90 years of innovation in power management and RF solutions.
The LM3204TLX/NOPB belongs to TI's RF Power Amplifier Bias IC product line, designed specifically to replace discrete buck converters and LDOs in space- and efficiency-critical mobile RF front ends.
FAQ
What is the primary function of the LM3204TLX/NOPB in an RF power amplifier stage?
The LM3204TLX/NOPB serves as a dynamically controllable step-down DC-DC converter that supplies precise, low-noise bias voltage to the collector or drain of RF power amplifiers. Its analog VCTRL pin enables real-time adjustment of output voltage to match instantaneous PA power demand - improving efficiency and linearity without external feedback components. This functionality is integral to the LM3204TLX/NOPB's role in modern envelope-tracking architectures.
How does the LM3204TLX/NOPB achieve high efficiency across varying load conditions?
The LM3204TLX/NOPB achieves high efficiency through three complementary mechanisms: (1) synchronous rectification with low-RDS(on) internal MOSFETs, (2) automatic transition into bypass mode when input-output differential drops below ~150 mV, and (3) 1.5 MHz fixed-frequency PWM operation that maintains consistent switching losses independent of load. These features allow the LM3204TLX/NOPB to sustain >90% efficiency from 10 mA to 1.5 A across its operating range.
Can the LM3204TLX/NOPB operate from a single Li-ion cell throughout its full discharge curve?
Yes, the LM3204TLX/NOPB supports input voltages from 2.7 V to 5.5 V, covering the entire usable discharge range of a single Li-ion cell (3.0 V nominal, down to 2.7 V cutoff). Its ability to maintain regulation at 2.7 V input while delivering up to 3.6 V output in bypass mode ensures uninterrupted RF PA operation - a key capability confirmed in the LM3204TLX/NOPB's electrical characteristics table under "Input Voltage Range".
What external components are required for basic LM3204TLX/NOPB operation?
Only three external components are required: a 1.0 µH power inductor, a 10 µF input ceramic capacitor, and a 10 µF output ceramic capacitor. No feedback resistors, compensation networks, or external MOSFETs are needed due to the LM3204TLX/NOPB's integrated architecture and analog VCTRL-based voltage setting. This minimal BOM is explicitly validated in the LM3204TLX/NOPB's Typical Application Circuit diagram (Figure 4-1).
Is thermal management critical for the LM3204TLX/NOPB in high-current applications?
Yes - the LM3204TLX/NOPB's 1.6 mm × 1.6 mm micro-SMD package relies on proper thermal pad soldering to the PCB ground plane for effective heat dissipation. At 1.5 A continuous load, junction temperature rise exceeds 40 °C without adequate copper area; TI recommends ≥100 mm² of 2-oz copper connected to the thermal pad. This requirement is specified in the LM3204TLX/NOPB's Micro-SMD Assembly Guidelines and confirmed by thermal characterization data in Section 7.4 of its datasheet.
LM3204TLX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 3.6V
- Current - Output:
- 500mA
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DSBGA
LM3204TLX/NOPB FAQ
1.How can I place an order for LM3204TLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3204TLX/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM3204TLX/NOPB reliable?
The price and inventory of LM3204TLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3204TLX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3204TLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3204TLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3204TLX/NOPB?
LM3204TLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3204TLX/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM3204TLX/NOPB?
For technical support, including LM3204TLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3204TLX/NOPB requirements.
6.How does Aetrix verify that LM3204TLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3204TLX/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM3204TLX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3204TLX/NOPB?
All LM3204TLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3204TLX/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM3204TLX/NOPB part is unused and in its original packaging.
Return procedure for LM3204TLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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